CN104406324B - Improved two-stage ejection type refrigerating system - Google Patents
Improved two-stage ejection type refrigerating system Download PDFInfo
- Publication number
- CN104406324B CN104406324B CN201410783823.6A CN201410783823A CN104406324B CN 104406324 B CN104406324 B CN 104406324B CN 201410783823 A CN201410783823 A CN 201410783823A CN 104406324 B CN104406324 B CN 104406324B
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- Prior art keywords
- ejector
- gas
- liquid
- pressure
- throttle valve
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B9/00—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
- F25B9/08—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point using ejectors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Jet Pumps And Other Pumps (AREA)
Abstract
The invention discloses an improved two-stage ejection type refrigerating system. The system comprises a condenser, wherein an output end of the condenser is divided into three ways, one way is connected with a first throttling valve, another way is connected with a pump, and the third way is sequentially connected with a second throttling valve, an evaporator and a first ejector; the output of a generator is divided into two ways, one way is connected with the first ejector, the other way is connected with a second ejector, and both the first ejector and the first throttling valve are connected with the second ejector. The system has the energy-saving effect, the required working gas volume from the generator is effectively decreased, the ejection rate is increased, the energy efficiency can be increased by about 10%, and the system is simple in structure, low in manufacturing cost and compact in structure.
Description
Technical field
The present invention relates to refrigeration technology field, more particularly, to a kind of improved twin-stage ejector refrigeration system.
Background technology
Spray type refrigerating is by a kind of Refrigeration Technique of heat-driven, can make full use of industrial exhaust heat, solar heat and
Other low-grade heat sources.Seldom, equipment is simple, reliable, with low cost for the mechanical energy that it consumes.Its working media can be
The environmental protection natural materials such as carbon dioxide, water, Hydrocarbon.
But it has the drawback that ejector, and compression is smaller, and cryogenic temperature is higher；And it runs the shadow being subject to back pressure
Ring, injection is smaller, and system energy efficiency is not high.
Application number 201210116545.x patent proposes " a kind of Auto-cascade jet type refrigerator ", and it adopts mixed working fluid
To realize the purpose compared with high pressure ratio with two ejectors, but complex structure is it is therefore an objective to obtain relatively low cryogenic temperature；Application number
201210166460.2 propose " a kind of double injection type cooling devices of gas-liquid ejector potentiation ", and the method utilizes gas-liquid injection
Device replaces the action of expansion valve, reclaims the demi-inflation work(being wasted in throttling process.
Application number 201310497335.4, patent name: " a kind of ejector type refrigerating machine with intermediate heat exchange member ", it leads to
Cross and adopt the intermediate heat exchange member such as economizer or subcooler, make the gas-phase working medium in economizer or subcooler be directly entered the
Two ejectors, without the recompression by the first ejector, thus reducing the load of the first ejector, improve system with this
Coefficient of refrigerating performance under high condensation temperature.But using economizer or subcooler still such that system complex.And the spray of its two-stage
Emitter is gas ejector, and the impact to injection ratio is less, and the improvement to ejector operating condition is limited.
Content of the invention
For solving the deficiency that prior art exists, the invention discloses a kind of improved twin-stage ejector refrigeration system, profit
Gas after first injector supercharging being heated up with the gas-liquid two-phase fluid after condenser throttling cools, both mixing
It is inhaled into together afterwards in second injector.On the one hand improve ejector operation conditions, on the other hand can improve injection ratio.Simultaneously
Due to segment fluid flow, directly pressure after throttling is compressed to condensing pressure, saves work gas scale needed for first injector, carries
High efficiency.
For achieving the above object, the concrete scheme of the present invention is as follows:
A kind of improved twin-stage ejector refrigeration system, including condenser, condenser outfan divides three tunnels, a road and first
Choke valve is connected, and another road is connected with pump, and the 3rd tunnel is connected with second throttle, vaporizer and the first ejector successively, described
The output of generator divides two-way, and a road is connected with the first ejector, and another road is connected with the second ejector, described first ejector
And first throttle valve is all connected with the second ejector.
Described second ejector is vehicle repair major ejector.Described second ejector outfan be provided with temperature sensor and
Pressure transducer, temperature sensor and pressure transducer and first throttle valve are all connected with controller.
Described controller according to temperature sensor and pressure transducer detection temperature signal and pressure signal and setting value
Being compared, then controller sends instruction as needed, controlling the aperture of first throttle valve, thus controlling the big of spouting liquid
Little, keep the second ejector outlet temperature and pressure in set point.
Draw a bye-pass from condensator outlet and be connected to first throttle valve, condensed fluid is after first throttle valve throttling
Pressure and temperature all reduces, and becomes gas-liquid two-phase fluid, this fluid with from first ejector supercharging after mixed gases, to gas
Body is cooled down, and is still biphase gas and liquid flow after both mixing.
After mixing formed gas-liquid two-phase fluid aspirated at b by the second ejector again, from generator gas to this
Biphase gas and liquid flow is pressurized, and own temperature and pressure also reduce simultaneously, flows after both mixing from the outlet c of the second ejector
Go out to enter in condenser.
Beneficial effects of the present invention:
The present invention has energy-saving effect, because pressure after energy-conservation for the segment fluid flow is directly compressed to condensing pressure, can save
Save work gas scale needed for first injector, improve system energy efficiency；In addition mutually conventional form, second ejector of the present invention is
Gas-liquid two-phase ejector, its Secondary Flow is biphase gas and liquid flow, and the injection ratio of the gas ejector being adopted than ever greatly increases；
Its comprehensive function can make system cop increase by 10% about.Compare and intercooling was carried out using subcooler or economizer more in the past
Form, small volume simple using throttle-valve structure, compares subcooler or economizer equal-volume can reduce 50% so that empty
Between arrange compacter, and cost can reduce by 10%.Subcooler or economizer line system complex, poor reliability, and using section
Stream valve only has two pipelines, and system reliability improves.
Brief description
The first improved twin-stage ejector refrigeration system structured flowchart of Fig. 1 present invention；
In figure, 1- generator；2- ejector；3- ejector；4- condenser；5- controller；6- choke valve；7- vaporizer；
8- choke valve, 9- pump
Specific embodiment:
The present invention is described in detail below in conjunction with the accompanying drawings:
As shown in figure 1, present invention seek to address that the injection ratio of existing twin-stage ejector refrigeration system presence is little, efficiency is low,
The high problem of Secondary Flow inlet temperature in the middle of ejector, to improve injection ratio and system energy efficiency.
A kind of improved twin-stage ejector refrigeration system, including condenser 4, condenser 4 outfan divides three tunnels, a road and section
Stream valve 6 is connected, and another road is connected with pump 9, and the 3rd tunnel is connected with choke valve 8, vaporizer 7 and ejector 2 successively, described generator
1 output divides two-way, and a road is connected with ejector 2, and another road is connected with ejector 3, described ejector 2 and choke valve 6 all with
Ejector 3 is connected.
Operation principle: the present invention exports extraction one bye-pass from condenser 4 and is connected to choke valve 6, and condensed fluid is through celebrating a festival
After stream valve 6 throttling, pressure and temperature all reduces, and becomes gas-liquid two-phase fluid, the gas phase after this fluid and blowing emitter 2 supercharging
Mixing, cools down to gas, is still biphase gas and liquid flow after both mixing.The gas-liquid two-phase fluid being formed after this mixing is sprayed again
Emitter 3 is aspirated at b, and the working gas from generator 1 is pressurized to this biphase gas and liquid flow, simultaneously own temperature and pressure
Also reduce, exit in condenser at the outlet c of blowing emitter 3 after both mixing.Useful effect using choke valve 6
It is: the temperature of the gas after can reducing through ejector 2, form biphase gas and liquid flow, such that it is able to increase the injection of ejector 3
Ratio improves the service condition of ejector 3；Simultaneously because segment fluid flow pressure after throttling is directly compressed to intermediate pressure, save
Work gas scale needed for first injector, thus decreasing the heat of generator needs, improves the efficiency of whole system.
During control, wherein choke valve 6 is electric expansion valve, and it is connected to controller 5, has temperature to pass at ejector 3 outlet c
Sensor and pressure transducer, are respectively connected to controller 5, and controller 5 is compared with setting value according to temperature signal and pressure signal
Relatively, then sending instruction as needed, control the aperture of choke valve 6, thus controlling the size of spouting liquid, keeping ejector 3 to go out
Mouth temperature and pressure is in set point.Can avoid ejector 3 that the not normal situation of work occurs using this kind of control model, and
System can be made to run under design conditions, improve system run all right and efficiency.
Wherein, second injector 3 is gas-liquid two-phase ejector, with respect to gas-phase injection device, can dramatically increase injection ratio.
Although the above-mentioned accompanying drawing that combines is described to the specific embodiment of the present invention, not model is protected to the present invention
The restriction enclosed, one of ordinary skill in the art should be understood that on the basis of technical scheme, and those skilled in the art are not
Need to pay the various modifications that creative work can make or deformation still within protection scope of the present invention.
Claims (3)
1. a kind of improved twin-stage ejector refrigeration system, is characterized in that, including condenser, generator, controller, condenser is defeated
Go out Duan Fen tri- tunnel, a road is connected with first throttle valve, and another road is connected with pump, the 3rd tunnel successively with second throttle, vaporizer
And first ejector be connected, the output of described generator divides two-way, and a road is connected with the first ejector, another road with second spray
Device is connected, and described first ejector and first throttle valve are all connected with the second ejector；Described second ejector is gas-liquid two-phase
Ejector；Described second ejector outfan is provided with temperature sensor and pressure transducer, temperature sensor and pressure sensing
Device and first throttle valve are all connected with controller；Described controller is according to the temperature letter of temperature sensor and pressure transducer detection
Number and pressure signal be compared with setting value, then controller sends instruction as needed, the aperture of control first throttle valve,
Thus controlling the size of spouting liquid, keep the second ejector outlet temperature and pressure in set point.
2. a kind of improved twin-stage ejector refrigeration system as claimed in claim 1, is characterized in that, draws from condensator outlet
One bye-pass is connected to first throttle valve, and condensed fluid pressure and temperature after first throttle valve throttling all reduces, and becomes gas
Gas-liquid two-phase liquid, this fluid and the mixed gases from after the first ejector supercharging, cool down to gas, after both mixing still
For biphase gas and liquid flow.
3. a kind of improved twin-stage ejector refrigeration system as claimed in claim 2, is characterized in that, the gas-liquid being formed after mixing
Two-phase fluid is aspirated at entrance b by the second ejector again, and the gas from generator is pressurized to this biphase gas and liquid flow, with
When own temperature and pressure also reduce, both mixing after exit in condenser from the outlet c of the second ejector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410783823.6A CN104406324B (en) | 2014-12-16 | 2014-12-16 | Improved two-stage ejection type refrigerating system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410783823.6A CN104406324B (en) | 2014-12-16 | 2014-12-16 | Improved two-stage ejection type refrigerating system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104406324A CN104406324A (en) | 2015-03-11 |
| CN104406324B true CN104406324B (en) | 2017-01-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410783823.6A Active CN104406324B (en) | 2014-12-16 | 2014-12-16 | Improved two-stage ejection type refrigerating system |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105042741B (en) * | 2015-07-07 | 2018-06-29 | 同济大学 | Ejector refrigeration and active beam-cooling use in conjunction system |
| CN107014107A (en) * | 2017-05-09 | 2017-08-04 | 上海海洋大学 | A kind of novel wind power drives ejector refrigeration system |
| CN115406131B (en) * | 2022-08-31 | 2023-11-28 | 华能国际电力股份有限公司 | Water-heat cogeneration system based on ejector and operation method |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4204454B2 (en) * | 2003-12-09 | 2009-01-07 | 大阪瓦斯株式会社 | Refrigeration equipment |
| CN101387457A (en) * | 2008-10-27 | 2009-03-18 | 中原工学院 | Multi-injector parallel connection type solar injection cooling device |
| CN101603749B (en) * | 2009-07-07 | 2011-06-15 | 河南科技大学 | Auto-cascade injection low-temperature refrigeration circulating device |
| JP2011094814A (en) * | 2009-10-27 | 2011-05-12 | Mitsubishi Electric Corp | Refrigerating cycle device and refrigerant compressing method |
| CN102230702B (en) * | 2011-06-03 | 2012-08-29 | 浙江大学 | Two-stage ejection refrigeration cycle system with economizer |
| CN102853578B (en) * | 2012-04-19 | 2014-06-25 | 浙江大学 | Mixed working medium two-stage jet type refrigerating machine |
| CN103528263B (en) * | 2013-10-21 | 2015-09-30 | 浙江大学宁波理工学院 | A kind of ejector type refrigerating machine with intermediate heat exchange member |
| CN204460827U (en) * | 2014-12-16 | 2015-07-08 | 山东大学 | A kind of twin-stage ejector refrigeration system of improvement |
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| CN104406324A (en) | 2015-03-11 |
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